Magneto-resistive removable hard disk cartridge and disk drive and quadrature embedded servo bursts

Abstract

A disk drive comprises a magneto-resistive read head and an inductive write head for use with removable hard disk cartridges. A four-burst embedded servo is written and read to guide the servo-positioning of the magneto-resistive read head over data tracks recorded on the removable hard disk.

What is claimed is:  
     
       1. A rotating disk drive for the magnetic storage of computer data, comprising: 
       a grounded actuator arm with an inductive head for writing and a magneto-resistive (MR) read head for reading a plurality of data tracks with embedded servo features on a surface of a rotating magnetic rigid disk within a removable cartridge;  
       grounding means for connecting said rotating magnetic rigid disk to a disk drive ground and the actuator to provide electrostatic discharge (ESD) protection to said MR head, wherein the voltage potential between said MR head and said rotating magnetic rigid disk is limited to two to three volts; and  
       cartridge receiving means proximate to the magneto-resistive read head for accepting and ejecting said removable cartridge.  
     
     
       2. The drive of claim  1 , further comprising: 
       a protective layer of hard and conductive material capping said magneto-resistive read head for separating it from said removable cartridge, wherein said magneto-resistive read head is protected from electrostatic discharge, wear and contamination.  
     
     
       3. The drive of claim  1 , further comprising: 
       read back means connected to the magnetoresistive read head for reading a track of data previously recorded by an inductive head with said removable cartridge.  
     
     
       4. The drive of claim  1 , further comprising: 
       spindle rotation means connected to said cartridge receiving means for rotating said removable cartridge at a first speed while reading a track of data previously recorded by an inductive head at a second speed with said removable cartridge, wherein said first and second speeds are independent.  
     
     
       5. The drive of claim  1 , further comprising: 
       embedded servo control means including a servo track pattern on said removable cartridge with a set of four positioning bursts written at four times a basic track density, wherein the magneto-resistive read head has available a linear servo feedback signal over the full width of said data track.  
     
     
       6. The drive of claim  1 , further comprising: 
       embedded servo control means including a servo track pattern on said removable cartridge with a set of at least four positioning bursts written at least at four times a basic track density, wherein the magneto-resistive read head has available a linear servo feedback signal over the full width of said data track.